| 1 | La Intrastate Gas Co LLC | | Oil Operator | Apr 2004 |
| 2 | Lakeshore Petroleum Corp. | | Oil & Gas Operator | Dec 1992 |
| 3 | Lamar Hunt | | Oil & Gas Operator | Oct 2003 |
| 4 | Lamson/Crocker Petroleum Corp. | | Oil & Gas Operator | May 1988 |
| 5 | Lamson/Onshore Petroleum Corp. | | Oil & Gas Operator | Sep 1985 |
| 6 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 7 | Lea Exploration, Inc. | | Oil & Gas Operator | Nov 1989 |
| 8 | Lear Petroleum Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 9 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 10 | LGS Exploration, Inc. | | Oil & Gas Operator | Jan 1991 |
| 11 | Liberty Oil And Gas Corp. | Olney, IL 62450-2489 | Oil & Gas Operator | Dec 2021 |
| 12 | Liberty Resources, Inc. | | Oil & Gas Operator | Dec 2024 |
| 13 | Linder Oil Company,A Partnership | Shreveport, LA 71136 | Oil & Gas Operator | Oct 2025 |
| 14 | Longview Production, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2002 |
| 15 | Louisiana Intrastate Gas Corp. | | Oil Operator | Feb 1994 |
| 16 | Louisiana Resources Co | | Oil Operator | May 1992 |
| 17 | Luca Operation, LLC | | Oil & Gas Operator | Feb 2016 |
| 18 | Lucky Lad Energy, LLC | Magnolia, TX 77353 | Oil & Gas Operator | Oct 2025 |